Perhaps you should try some spelling variations:
"dioxin emissions" » "dioxide emissions", "dioxide emission", "union emissions"
"toxic emissions" » "atomic emission", "voc emissions", "dioxide emissions"
"oxide emissions" » "dioxide emissions"
"down emissions" » "von emissions", "photon emissions"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("toxic emissions") OR ((((("dioxin emissions") OR ("down emissions"))) OR ("oxide emissions"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"toxic emissions\") or (((((\"dioxin emissions\") OR (\"down emissions\"))) or (\"oxide emissions\"))))*".
• Removing quotes may allow a broader search: (( toxic emissions ) or ((((( dioxin emissions ) OR ( down emissions ))) or ( oxide emissions ))))*.